After searching unsuccessfully for a simple list of countries who can take advantage of a Google Places listing, here is the official list taken from the code of the Google Places page:
Afghanistan, Algeria, American Samoa, Andorra, Angola, Argentina, Australia, Austria, Bahrain, Bangladesh, Belgium, Benin, Bhutan, Botswana, Brazil, Brunei, Bulgaria, Burundi, Cambodia, Canada, Central African Republic, Chad, Chile, China, Côte D’ivoire, Croatia, Czech Republic, Democratic Republic of the Congo, Denmark, Djibouti, Egypt, Estonia, Ethiopia, Fiji, Finland, France, French Polynesia, Gabon, Gambia, Germany, Ghana, Greece, Guam, Hong Kong, Hungary, Iceland, India, Indonesia, Iraq, Ireland, Israel, Italy, Japan, Jordan, Kazakhstan, Kenya, Kuwait, Kyrgyzstan, Laos, Latvia, Lebanon, Liechtenstein, Lithuania, Luxembourg, Macao, Macedonia, Madagascar, Malawi, Malaysia, Maldives, Malta, Mauritius, Mexico, Mongolia, Morocco, Mozambique, Myanmar(Burma), Namibia, Nepal, Netherlands, New Caledonia, New Zealand, Nigeria, Northern Mariana Islands, Norway, Oman, Pakistan, Palau, Papua New Guinea, Philippines, Poland, Portugal, Qatar, Republic of the Congo, Romania, Russia, Rwanda, Samoa, São Tomé And Príncipe, Saudi Arabia, Senegal, Serbia, Seychelles, Sierra Leone, Singapore, Slovakia, Slovenia, Solomon Islands, South Korea, South Africa, Spain, Sri Lanka, Sweden, Switzerland, Taiwan, Tajikistan, Tanzania, Thailand, Togo, Tonga, Tunisia, Turkey, Turkmenistan, Uganda, Ukraine, United Arab Emirates, United Kingdom, United States, Uzbekistan, Vanuatu, Vietnam, Yemen, Zambia, Zimbabwe.
Copy and paste as you wish.
The official help provides much more detail. http://www.google.com/support/places/bin/answer.py?hl=en&answer=168339